Panbiogeography: The New World

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Page 92I shall refrain from a discussion of the various proposed transpacific landbridges.
They are faunistically possible, but find no geological support. There is, however,
some evidence for considerable recent tectonic activity in and south of the ...

Page 95To put this in other words: The correct position in biogeo- graphy before landbridges is the very same maintained in algebra before an unknown quantity.
This quantity is supposed to be known, and is replaced in the statement of the
problem ...

Page 2005) "The numerous hypothetical landbridges in temperate tropical and southern
regions, connecting continents now separated by deep oceans, which have been
advocated by various authors, are improbable and unnecessary to explain ...